Card-grinding roller



(No. Model.)

W. B. GUILD.

CARD GRINDING'ROLL'ER.

N0..299,131. Patented May 2'7, 1884.

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\V ALTER l. GUILD, OF BOSTON, MASSACHUSETTS.

CARD GRlNDING ROLLER.

SPECIFICATION forming partof Letters Patent No. 299,131, dated May 27, 1884. Application filed October 24, 1883. (No model.)

To all whom, it may concern Be it known that I, WALTER B. GUILD, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Card-Grinding Rollers; and I do hereby declare that the same are fully described in the following specification, and illustrated in the accompanying drawing.

The object of this invention is to provide an improved card-grinding roller for use with appropriate mechanism for the purpose of sharpening the points of the wire teeth ofmachine-cards. Various devices have heretofore been employed to accomplish this end, the most successful having a grinder with a reciprocating or traverse motion over the face of the card. Perhaps the most popular device has a grinding-wheel about five inches in diameter and four or five inches face, arranged to rapidly traverse on a shaft the entire width of a cardthat is, from thirty to fiftyinchesand of course grinding at no time upon more than five inches of surface. In this traverse motion the sides or edges of the wheel press against the sides or edges of the teeth at and near their points, thus grinding the sides as well as the front of the points. It is noticeable that the edges of the wheel are the most effective parts in forming the needle-points desired in card-clothing.

Based on these observations, my improve- .ment consists in a roller extending over' and adapted to act on the entire width of the card at once, and having a succession of cylindrical grinding-surfaces separated by a series of independent circumferential grooves, as shown in the drawing, which is a plan of the roller detached from its frame and operating devices. This roller has a slight traverse motion about equal in extent to the width of one of the grinding suriaces, so that by this short travel all the card-teeth within the range of the entire roller will be acted upon not only by the several cylindrical grinding-surfaces, but also by the walls of the successive grooves acting edgewise simultaneously on the sides of the cardteeth. The cylindrical grinding-surfaces are shown at A A, and the separating-grooves at B B.

grooves is that (the clothing being quite elastie) the points will spring to place with the passage of each groove as the roller reciprocates in its rotation. The edges of each groove act on the sides of the wire points, thus producing with the cylindrical surfaces the nee dle-points on the teeth. The sides of each groove and the grindingfaces A A act on the teeth precisely as do the sides and face of the single traversing Wheel referred to; but in stead of such action at a single point, as in that device, my grooved roller is acting in many different places at once, vastly enhancing its efficiency. Thus with the roller shown in the drawing, having ten grooves and eleven cylindrical faces, the effect will be as though eleven wheels were grinding the card and eleven edges were operating to form needlepoints continually. These narrow grindingfaces, separated by deep grooves, give opportunity for air-currents to cool the teeth in the intervals of grinding, with the effect of not injuring the temper of the steel teeth now largely used.

I claim as myinvention The improved card-grinding roller herein described,extending the full width of the card, and consisting of a series of cylindrical grinding-sections, A, separated by independent circumferential grooves B, having the ventilating and edge-grinding capabilities, substantially as set forth.

In testimony whereof I hereto affix my signaturein presence of two witnesses.

W'ALTER B. GUILD.

XVitnesses:

A. H. SPENOER, J. O. BISHOP. 

